CN219612087U - Central power supply emergency lighting system - Google Patents
Central power supply emergency lighting system Download PDFInfo
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- CN219612087U CN219612087U CN202223605514.9U CN202223605514U CN219612087U CN 219612087 U CN219612087 U CN 219612087U CN 202223605514 U CN202223605514 U CN 202223605514U CN 219612087 U CN219612087 U CN 219612087U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model provides a central power supply emergency lighting system which comprises an EMC filtering rectification circuit, a primary side circuit, a transformer, a secondary side circuit, a feedback circuit and a mains supply detection circuit. The EMC filtering rectification circuit is connected with the central power supply to carry out rectification and filtering; the primary circuit is connected with a central power supply after rectification and filtration; the transformer is used for transforming the voltage of the primary circuit; the secondary side circuit rectifies the transformed power supply and transmits the rectified power supply to the emergency lighting device; the feedback circuit is used for feeding back the change of the secondary side circuit to the primary side circuit; the mains supply detection circuit detects whether regional mains supply is abnormal or not and is used for controlling the conduction of the primary circuit when the regional mains supply is abnormal. By adding a mains supply detection function in the regional emergency lighting system, when the detected regional mains supply is normal, the emergency lighting output is kept off; and when the regional mains supply is abnormal, the emergency lighting system is driven to receive the feed of the central power supply, so that reliable emergency lighting is ensured.
Description
Technical Field
The utility model relates to the field of emergency lighting, in particular to a central power supply emergency lighting system.
Background
Emergency lighting is lighting that is enabled by failure of the power supply (mains) for normal lighting, and in industrial and residential buildings, emergency lighting systems have been widely used because it is in emergency situations that ensure the life safety of the masses and safe evacuation of dangerous places. And at the same time, necessary operations can be performed to effectively prevent the spread of disasters or faults.
It is therefore necessary to detect the mains to determine if the mains is ageing and thus whether to activate the emergency lighting. The existing commercial power detection is to detect the commercial power state at a terminal of a centralized power supply system, so that reliable emergency illumination cannot be provided after partial area power failure. In view of this, it is a technical problem to be solved in the art how to ensure reliable emergency lighting of an area.
Disclosure of Invention
In order to solve the problems, the utility model is realized by the following technical scheme:
a centrally powered emergency lighting system comprising:
the EMC filtering rectification circuit is connected with a central power supply and used for rectifying and filtering the central power supply;
the primary circuit is connected with the EMC filtering rectification circuit and is used for being connected with a central power supply after rectification and filtration;
the output end of the primary side circuit is connected with a primary side coil of the transformer, the transformer is used for transforming the voltage of the primary side circuit,
the input end of the secondary side circuit is connected with the secondary side coil of the transformer, and the output end of the secondary side circuit is connected with the primary side circuit and the emergency lighting device and is used for rectifying the transformed power supply and transmitting the rectified power supply to the emergency lighting device;
the feedback circuit is connected between the secondary side circuit and the primary side circuit and is used for feeding back the change of the secondary side circuit to the primary side circuit;
and the input end of the commercial power detection circuit is connected with the regional commercial power so as to detect whether the regional commercial power is abnormal, and the output end of the commercial power detection circuit is electrically connected with the primary side circuit and is used for controlling the conduction of the primary side circuit when the regional commercial power is abnormal.
Further, the mains supply detection circuit comprises a mains supply access end, a safety resistor connected with the regional mains supply access end, a rectifier diode connected with the other end of the safety resistor, a voltage reducing component connected with the rectifier diode, and a filtering rectifier component connected with the voltage reducing component; the output end of the commercial power detection circuit is connected with the filtering rectifying component; the positive pole of the rectifier diode is connected with the safety resistor.
Further, the voltage reducing component comprises four voltage stabilizing diodes which are connected in series in the same direction, and the cathode of each voltage stabilizing diode is connected with the cathode of each rectifying diode.
Further, the output end of the commercial power detection circuit is a light emitter of the photoelectric coupler.
Further, the filtering rectifying component comprises an electrolytic capacitor, a resistor and a zener diode which are connected in parallel; one end of the filtering rectifying component is connected with the output end of the voltage reducing component, and the other end of the filtering rectifying component is connected with the negative electrode of the mains supply access end.
10. Further, the primary side circuit comprises a power chip, an NMOS tube connected with an EN/UV pin of the power chip and a feedback signal receiving end of the feedback circuit respectively, a fourteenth diode connected with a BP/M pin of the power chip and a commercial power signal receiving end matched with an output end of the commercial power detection circuit; the S pin of the power supply chip and the other end of the feedback signal receiving end are grounded; BP/M pin of the said power chip is grounded through sixteenth electric capacity; the other end of the commercial signal receiving end is connected with the grid electrode of the NMOS tube, and the source stage of the NMOS tube is grounded;
the DRAIN pin of the power chip is connected with the primary side first coil of the transformer, the BP/M pin of the power chip is connected with one end of the primary side second coil of the transformer through a fifth resistor and a third diode, and the other end of the primary side second coil is grounded.
Further, the commercial signal receiving end is a light receiver of the photoelectric coupler.
Further, the primary circuit further comprises a peak absorption circuit, wherein the peak absorption circuit comprises a first diode, a third capacitor, a sixth resistor, a seventh resistor and a thirty-first resistor; the third capacitor, the sixth resistor and the first diode are connected in series and then connected in parallel with two ends of a primary side first coil of the transformer, and the seventh resistor and the thirty-first resistor are connected in series and then connected in parallel with two ends of the third capacitor; wherein, the negative pole of first diode with sixth resistance links to each other.
Further, TNY288P is adopted for the power chip.
Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:
(1) According to the utility model, the emergency lighting output is kept closed when the area commercial power is detected to be normal by adding the commercial power detection function in the area emergency lighting; and when the regional mains supply is abnormal, the emergency lighting system is driven to receive the feed of the central power supply, so that reliable emergency lighting is ensured, and the mains supply detection circuit is simple and the cost is optimized.
(2) The step-down component provided by the utility model is composed of four voltage stabilizing diodes which are connected in series in the same direction, and the abnormal range of the regional mains supply can be controlled within-5V, so that the accuracy of the regional mains supply detection is improved.
(3) The peak absorption circuit is used for inhibiting surge voltage generated by the switching power supply and improving EMC interference.
Drawings
FIG. 1 is a schematic block diagram of a centrally powered emergency lighting system provided in an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a commercial power detection circuit provided by an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a primary side circuit provided by an embodiment of the present utility model;
fig. 4 is a schematic diagram of an EMC filter rectifying circuit according to an embodiment of the present utility model;
fig. 5 is a schematic diagram of a secondary side circuit and a feedback circuit according to an embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, a central power supply emergency lighting system includes an EMC filter rectifying circuit, a primary side circuit, a transformer, a secondary side circuit, a feedback circuit and a mains supply detection circuit. The EMC filtering rectification circuit is connected with a central power supply and used for rectifying and filtering the central power supply; the primary side circuit is connected with the EMC filtering rectification circuit and is connected with a central power supply after rectification and filtration; the output end of the primary circuit is connected with a primary side coil of a transformer, and the transformer transforms the voltage of the primary circuit; the input end of the secondary side circuit is connected with the secondary side coil of the transformer, the output end of the secondary side circuit is connected with the primary side circuit and the emergency lighting device, and the transformed power supply is rectified and transmitted to the emergency lighting device; the feedback circuit is connected between the secondary side circuit and the primary side circuit and is used for feeding back the change of the secondary side circuit to the primary side circuit; the input end of the mains supply detection circuit is connected with regional mains supply, so that whether the regional mains supply is abnormal or not is detected, and the output end of the mains supply detection circuit is electrically connected with the primary side circuit and is used for controlling the primary side circuit to be conducted when the regional mains supply is abnormal.
By adding a mains supply detection function in the regional emergency lighting system, when the detected regional mains supply is normal, the emergency lighting output is kept off; and when the regional mains supply is abnormal, the emergency lighting system is driven to receive the feed of the central power supply, so that reliable emergency lighting is ensured.
Referring to fig. 2, the mains supply detection circuit includes a mains supply access terminal CON2, a safety resistor FS2 connected to the mains supply access terminal CON2, a rectifying diode D5 connected to the other end of the safety resistor FS2, a step-down component connected to the rectifying diode D5, and a filtering rectifying component connected to the step-down component. The output end of the commercial power detection circuit is connected with the filtering rectifying component; the positive pole of the rectifier diode D5 is connected to the fuse FS 2. The output end of the commercial power detection circuit is connected with the filtering rectifying component; the positive pole of the rectifier diode D5 is connected to the fuse FS 2. In this embodiment, the positive electrode of the mains supply access terminal CON2 is connected to the live wire of the mains supply in the alternating current region with about 220V, and after being protected by the safety resistor FS2, the mains supply detection signal is sent out by the output terminal of the mains supply detection circuit after being rectified by the rectifying diode D5, reduced in voltage by the voltage reducing component and rectified and filtered by the filtering component.
In this embodiment, the step-down component includes four zener diodes (D6, D7, D8, D9) connected in series in the same direction, and the cathode of the zener diode D6 is connected to the cathode of the rectifying diode D5. The filtering rectifying component comprises an electrolytic capacitor CE3, a resistor R20 and a zener diode D10 which are connected in parallel; one end of the filtering rectifying component is connected with the positive electrode of the voltage stabilizing diode D9, and the other end of the filtering rectifying component is connected with the negative electrode of the mains supply access end CON2, namely a zero line of regional mains supply, so as to form a loop. The output end of the commercial power detection circuit is photoelectrically coupled with the current which is subjected to frequent rectification, voltage reduction and rectification and filtering by the commercial power and is insufficient to light the illuminator IC3A of the illuminator IC3A. When the regional commercial power is normal, the commercial power is rectified, reduced in voltage and rectified and filtered, and then is supplied to the illuminator IC3A, and the illuminator IC3A emits light normally. When the area commercial power is abnormal (lower than the normal value by a certain range), the light emitter IC3A is turned off. The utility power detection circuit of the embodiment can control the abnormal range within-5V, namely, the regional utility power is lower than the normal value by 5V, and then emergency illumination can be started.
Referring to fig. 3, the primary circuit includes a power chip U3, the power chip U3 employs TNY288P, and a first pin of the power chip U3 is electrically connected to one end of the capacitor C7, the 4 pin of the light receiver IC3B, and the drain of the NMOS transistor Q1, respectively. The second pin of the power chip U3 is electrically connected to one end of the capacitor C16, the anode of the diode D14, and one end of the resistor R5, respectively. The fourth pin of the power chip U3 is electrically connected to one end of the primary side first coil TR1A of the transformer, the anode of the diode D3 is electrically connected to one end of the primary side second coil TR1B of the transformer, the cathode of the diode D3 is electrically connected to one end of the capacitor C12 and the other end of the resistor R5, and the cathode of the diode D14 is electrically connected to one end of the resistor R1. The other end of the resistor R1 is electrically connected with a fourth pin of the light receiver IC3B, the third pin of the optocoupler light receiver IC3B is electrically connected with one end of the resistor R2, one end of the capacitor C17 and the grid electrode of the N-channel field effect transistor Q1 respectively, the cathode of the diode D1 is electrically connected with the resistor R6, the other end of the resistor R6 is electrically connected with one end of the resistor R30 and one end of the capacitor C3 respectively, the other end of the resistor R30 is electrically connected with one end of the resistor R7, and the other end of the capacitor C3 is electrically connected with the other end of the resistor R7 and the other end of the primary side first coil TR1A of the transformer respectively. The fifth pin, the sixth pin, the seventh pin and the eighth pin of the power chip U3 are grounded to the other end of the capacitor C12, the other end of the capacitor C16, the third pin of the light receiver IC2B, the other end of the capacitor C7 and the other end of the magnetic induction coil TR1B, respectively. The other end of the resistor R2, the other end of the capacitor C17 and the source electrode of the NMOS tube are grounded.
When the regional mains supply and the central power supply coexist, the light emitter IC3A of the photoelectric coupler emits light, namely the light emitting diode emits light, after the light receiver IC3B of the photoelectric coupler receives the light signal, the triode in the photoelectric coupler is pulled down after being conducted, the first pin of the power supply chip U3 cannot be enabled, the power supply chip U3 is in a static state, namely when the regional mains supply is normally powered, the light emitter IC3A emits light, the power supply chip U3 does not work, and emergency lighting is not started. When the regional mains supply is abnormal, the mains supply detection circuit can know that the current after frequent rectification, voltage reduction and rectification and filtration of the mains supply is insufficient to light the illuminator IC3A, the central power supply still exists, the primary side coil TR1A of the transformer supplies energy for the power supply chip U3 at the moment, the emergency lighting is started, and the fourth pin of the power supply chip U3 supplies internal running current for the starting and steady-state running of the emergency lighting.
The primary circuit further includes a peak absorption circuit, which includes a first diode D1, a third capacitor C3, a sixth resistor R6, a seventh resistor R7, and a thirty-first resistor R30. The third capacitor C3, the sixth resistor R6 and the first diode D1 are connected in series and then connected in parallel with two ends of the primary side first coil TR1A of the transformer, and the seventh resistor R7 and the thirty-first resistor R30 are connected in series and then connected in parallel with two ends of the third capacitor C3. Wherein the cathode of the first diode D1 is connected to the sixth resistor R6. The peak absorption circuit is used for inhibiting surge voltage generated by the switching power supply and improving EMC interference; if the peak absorbing circuit is damaged, a switching tube integrated inside the power supply chip U3 may be damaged, or noise may be generated by the switching power supply.
Referring to fig. 4, the embodiment further provides an EMC filtering rectifier circuit, where the central power supply connection terminal CON1 is connected to an ac or dc power supply of 50V, 110V, 240V, or the like, and the plastic-case fuse FS1 provides an abnormal protection for the power supply, and when the current is abnormal, the fuse is blown when reaching a certain height, so that the whole circuit can be cut off, and a protection effect is achieved. The safety capacitor C1 is EMC differential mode filtering, and is connected across the capacitor between two lines (L-N) of the power line for inhibiting differential mode interference. The E-type common mode inductor L1 is used for filtering common mode interference signals, when common mode interference current flows through the coil, due to the same direction of the common mode interference current, a magnetic field in the same direction is generated in the coil to increase the inductance of the coil, so that the coil is high in impedance, a strong damping effect is generated, and the common mode interference current is attenuated, so that the purpose of filtering is achieved. The varistor RV1 has the functions of lightning protection and overvoltage protection, and when a large current is struck by lightning, the varistor breaks down and shorts and burns out the protective tube immediately, thereby achieving the purpose of protecting the circuit. When overvoltage occurs, the piezoresistor is broken down to present a short circuit state, so that the voltage at two ends of the piezoresistor is clamped at a lower level, and meanwhile, overcurrent caused by the short circuit burns a front protective tube or forces an air switch to trip, so that the power supply is forcibly cut off. The rectifier bridge DB1 functions to convert an input alternating current into a direct current. The valley filling circuit is characterized in that the valley filling circuit behind the rectifier bridge is utilized to greatly increase the conduction angle of the rectifier tube, and the peak pulse of the input current is changed into a waveform close to a sine wave by filling the valley point, so that the power factor is improved to about 0.9, and the total harmonic distortion is obviously reduced. Compared with the traditional inductance type passive power factor correction circuit, the inductance type passive power factor correction circuit has the advantages of simple circuit, lower cost, obvious power factor compensation effect and no need of using a large inductor with large volume and heavy weight in an input circuit. The capacitor C4 is used for filtering the common mode interference signal.
Referring to fig. 5, the present embodiment further provides a secondary circuit and a feedback circuit, in which the secondary winding TR1D, the diode D13, the electrolytic capacitor CE6, and the resistor R26 provide +vcc voltage for the secondary control circuit. The transformer secondarily measures the first coil TR1C, the Schottky diode D2 and the electrolytic capacitor CE4 to realize output rectification and filtering conversion into direct-current voltage, and the direct-current voltage supplies power to the two parts respectively: the first part directly provides emergency lighting equipment output for the drive through a secondary side rectifying circuit; the second portion provides an input voltage to the feedback circuit through the LDO circuit. The resistor R25, the capacitor C2, the resistor R17 and the capacitor C13 respectively form a peak absorption circuit, which is used for reducing the voltage stress of the diodes D13 and D2 and improving the EMC interference of the LED driving circuit. An LDO circuit is formed by an electrolytic capacitor CE4, a resistor R26, an NPN triode and a voltage stabilizing diode DZ2, and the flyback output rectified direct current voltage is converted into 5.1V voltage to provide stable voltage for a feedback circuit; the resistor R15, the voltage reference source ref, the capacitor C11, the resistor R21, the resistor R22 and the resistor R23 provide a reference voltage, the resistor R10 and the resistor R11 are used for sampling output current, the PWM switch of the chip U3 is controlled after the output current is compared with the reference voltage, constant current output is realized, and a compensation circuit is formed by the capacitor C8, the resistor R13, the capacitor C9, the resistor R14, the resistor R9 and the resistor R11, so that negative feedback is realized.
According to the utility model, the emergency lighting output is kept closed when the area commercial power is detected to be normal by adding the commercial power detection function in the area emergency lighting; and when the regional mains supply is abnormal, the emergency lighting system is driven to receive the feed of the central power supply, so that reliable emergency lighting is ensured, and the mains supply detection circuit is simple and the cost is optimized.
While the foregoing description illustrates and describes the preferred embodiments of the present utility model, it is to be understood that the utility model is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, but is capable of use in various other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept, either as described above or as a matter of skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.
Claims (9)
1. A centrally powered emergency lighting system, comprising:
the EMC filtering rectification circuit is connected with a central power supply and used for rectifying and filtering the central power supply;
the primary circuit is connected with the EMC filtering rectification circuit and is used for being connected with a central power supply after rectification and filtration;
the output end of the primary side circuit is connected with a primary side coil of the transformer, the transformer is used for transforming the voltage of the primary side circuit,
the input end of the secondary side circuit is connected with the secondary side coil of the transformer, and the output end of the secondary side circuit is connected with the primary side circuit and the emergency lighting device and is used for rectifying the transformed power supply and transmitting the rectified power supply to the emergency lighting device;
the feedback circuit is connected between the secondary side circuit and the primary side circuit and is used for feeding back the change of the secondary side circuit to the primary side circuit;
and the input end of the commercial power detection circuit is connected with the regional commercial power so as to detect whether the regional commercial power is abnormal, and the output end of the commercial power detection circuit is electrically connected with the primary side circuit and is used for controlling the conduction of the primary side circuit when the regional commercial power is abnormal.
2. The central powered emergency lighting system of claim 1, wherein the mains detection circuit comprises a mains access terminal, a safety resistor connected to the regional mains access terminal, a rectifier diode connected to the other end of the safety resistor, a buck component connected to the rectifier diode, and a filter rectifier component connected to the buck component; the output end of the commercial power detection circuit is connected with the filtering rectifying component; the positive pole of the rectifier diode is connected with the safety resistor.
3. The system of claim 2, wherein the buck assembly comprises four zener diodes connected in series in the same direction, the negative pole of the zener diodes being connected to the negative pole of the rectifier diodes.
4. The system of claim 1, wherein the output of the mains detection circuit is a light emitter of a photocoupler.
5. The system of claim 2, wherein the filter rectifying assembly comprises an electrolytic capacitor, a resistor and a zener diode connected in parallel; one end of the filtering rectifying component is connected with the output end of the voltage reducing component, and the other end of the filtering rectifying component is connected with the negative electrode of the mains supply access end.
6. The central power supply emergency lighting system according to claim 1, wherein the primary side circuit comprises a power supply chip, an NMOS tube connected with an EN/UV pin of the power supply chip and a feedback signal receiving end of the feedback circuit, a fourteenth diode connected with a BP/M pin of the power supply chip, and a mains signal receiving end adapted to an output end of the mains detection circuit; the S pin of the power supply chip and the other end of the feedback signal receiving end are grounded; BP/M pin of the said power chip is grounded through sixteenth electric capacity; the other end of the commercial signal receiving end is connected with the grid electrode of the NMOS tube, and the source stage of the NMOS tube is grounded;
the DRAIN pin of the power chip is connected with the primary side first coil of the transformer, the BP/M pin of the power chip is connected with one end of the primary side second coil of the transformer through a fifth resistor and a third diode, and the other end of the primary side second coil is grounded.
7. The system of claim 6, wherein the mains signal receiving terminal is a light receiver of a photocoupler.
8. The center powered emergency lighting system of claim 1 wherein the primary side circuit further comprises a peak absorption circuit comprising a first diode, a third capacitor, a sixth resistor, a seventh resistor, and a thirty-first resistor; the third capacitor, the sixth resistor and the first diode are connected in series and then connected in parallel with two ends of a primary side first coil of the transformer, and the seventh resistor and the thirty-first resistor are connected in series and then connected in parallel with two ends of the third capacitor; wherein, the negative pole of first diode with sixth resistance links to each other.
9. The system of claim 6, wherein the power chip is TNY288P.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223605514.9U CN219612087U (en) | 2022-12-30 | 2022-12-30 | Central power supply emergency lighting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223605514.9U CN219612087U (en) | 2022-12-30 | 2022-12-30 | Central power supply emergency lighting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219612087U true CN219612087U (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223605514.9U Active CN219612087U (en) | 2022-12-30 | 2022-12-30 | Central power supply emergency lighting system |
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| Country | Link |
|---|---|
| CN (1) | CN219612087U (en) |
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- 2022-12-30 CN CN202223605514.9U patent/CN219612087U/en active Active
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